Add 18/90 and 60/21
1st number: 18/90, 2nd number: 2 18/21
18/90 + 60/21 is 107/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 21 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
18/90 = 18 × 7/90 × 7 = 126/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
60/21 = 60 × 30/21 × 30 = 1800/630 - Add the two like fractions:
126/630 + 1800/630 = 126 + 1800/630 = 1926/630 - 1926/630 simplified gives 107/35
- So, 18/90 + 60/21 = 107/35
In mixed form: 32/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/90+60/21 18/90+60/42 54/90+60/21 18/90+60/63